https://readlevel.io/ monthly 1.0 https://readlevel.io/guides monthly 0.8 https://readlevel.io/guides/cefr-readability monthly 0.7 https://readlevel.io/guides/esl-suitable-text monthly 0.7 https://readlevel.io/guides/reading-levels-explained monthly 0.7 https://readlevel.io/guides/uk-secondary-readability monthly 0.7 https://readlevel.io/guides/accessibility-readability monthly 0.7 https://readlevel.io/guides/us-language-frameworks monthly 0.7 https://readlevel.io/features monthly 0.6 https://readlevel.io/how-it-works monthly 0.6